Size and weight are big decision factors when you are trying to find the ideal camera for your needs.
In this section, we are going to illustrate the Nikon 1 J4 and Panasonic FZ100 side-by-side from the front, back and top in their relative dimensions. Nikon 1 J4 has external dimensions of 100 x 60 x 29 mm (3.92 x 2.36 x 1.12″) and weighs 232 g (0.51 lb / 8.18 oz) (including batteries). Panasonic FZ100 has external dimensions of 124 x 82 x 92 mm (4.88 x 3.23 x 3.62″) and weighs 540 g (1.19 lb / 19.05 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon 1 J4 and the Panasonic FZ100. Nikon 1 J4 is clearly the smaller of the two cameras. Its body is 24mm narrower, 22mm shorter and 63mm thinner than Panasonic FZ100. As you can tell, actually this is not a fair size comparison since Panasonic FZ100 has a built-in lens but Nikon 1 J4 doesn't. Once you put a lens on 1 J4, its thickness will increase significantly.
Here is the back view size comparison of the Nikon 1 J4 and Panasonic FZ100.
Now lets look at the top view comparison of Nikon 1 J4 and Panasonic FZ100.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon 1 J4 is significantly lighter (308g ) than the Panasonic FZ100 which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on 1 J4, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Nikon 1 J4 nor Panasonic Lumix DMC-FZ100 provides any type of weather sealing in their bodies, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Mirrorless Cameras with Weather Sealing Top Bridge Cameras with Weather Sealing
LCD Screen Size and Features
Nikon 1 J4 and Panasonic FZ100's LCD screens have the same diagonal size of 3.00 inches.
On the other hand, Panasonic FZ100 sports a
Fully Articulated screen which you can change the angle and position of the screen almost freely, making it possible to shoot from waist or over-the-head levels, and especially very useful for shooting selfies and video. Nikon 1 J4's LCD screen is a fixed type which provides almost no flexibility in shooting positions compared to FZ100.